<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>

    let arr = [{name: 'jack'}]

    let arr2 = [{name: 'jack'}]

    arr[0].name = 'change1'
    console.log(arr)

    arr2[0]['name'] = 'change2'
    console.log(arr2)


    let date = "2000-01-01 00:00:00"
    let t = new Date(date).getTime()
    let k = new Date(t)
    console.log(k)

</script>
</body>
</html>